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Yep, I have a different issue. That doesn't solve it for me. I uninstalled the Ubuntu package entirely and installed the cacti tarball manually. I'm still having the same issue. I did try the php5 thing. I made sure php5 was used in my cron stuff.
To any other poor souls with this issue: Verify that your crontab entry for the poller is running in a user that can write to the rra directory. I was banging my head with these symptoms until I realized that I had the cron setup for 'cactiuser' when 'apache' had access to the directory exclusively. Hope that helps.